8422686721 has 4 divisors (see below), whose sum is σ = 8422990852. Its totient is φ = 8422382592.

The previous prime is 8422686709. The next prime is 8422686749. The reversal of 8422686721 is 1276862248.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1427706225 + 6994980496 = 37785^2 + 83636^2 .

It is a cyclic number.

It is not a de Polignac number, because 8422686721 - 2⁵ = 8422686689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8422686221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 105840 + ... + 167473.

It is an arithmetic number, because the mean of its divisors is an integer number (2105747713).

It is a Proth number, since it is equal to 16065 ⋅ 2¹⁹ + 1 and 16065 < 2¹⁹.

Almost surely, 2^8422686721 is an apocalyptic number.

It is an amenable number.

8422686721 is a deficient number, since it is larger than the sum of its proper divisors (304131).

8422686721 is a wasteful number, since it uses less digits than its factorization.

8422686721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 304130.

The product of its digits is 516096, while the sum is 46.

The square root of 8422686721 is about 91775.1966546517. The cubic root of 8422686721 is about 2034.6211241602.

The spelling of 8422686721 in words is "eight billion, four hundred twenty-two million, six hundred eighty-six thousand, seven hundred twenty-one".